Optimization of multibeam klystron double gap cavities loaded by metal rods

摘要

In this paper, the results of numerical investigation of a metal photonic band gap cavity are presented. The investigated resonator is dual-gap and is considered as an intermediate for theK-band multibeam klystron. A working mode is a 2nmode with a frequency of 24.15 GHz. Electrodynamic characteristics of the cavity (characteristic impendance, beam coupling factor, relative electronic conductivity,Q-factor) were calculated and the conditions for achieving the maximum effciency are found. Based on the obtained data, the required number of gaps in the output cavity was estimated, as well as the power and efficiency of the multibeam klystron with this type of cavities, depending on the microperveance of the electron beam.